Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-06-17
1994-11-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330269, 330270, 330274, H03F 345, H03F 330
Patent
active
053610415
ABSTRACT:
An improved push-pull amplifier having a driver circuit for driving a source follower output transistor. The driver circuit includes a replicating transistor having electrical characteristics substantially similar to those of the source follower transistor, a buffer amplifier, and a circuit, coupled to the replicating transistor and the buffer amplifier, for summing the voltage across the replicating transistor and the buffer output signal to provide a gate signal to the source follower output transistor. A cross current feedback circuit regulates the quiescent current flow through the output transistors by adjusting the gate signal provided to the upper, source follower output transistor in response to a sensed current flow through the lower output transistor.
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A Head Actuator Driver IC for Hard-Disk Drives, Uenten, P., ISSCC 93/Session 13/Hard Disk and Tape Drives/Paper FA 13.6, Feb. 26, 1993, pp. 222, 223, 292.
"V-FET Amplifier", Elector, Jul./Aug. 1980, pp. 7-10, 7-11.
Mullins James B.
Unitrode Corporation
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